The main role of insulin is anti-catabolism, which means that it stops you breaking down tissue. In type 1 diabetes, you have to take exogenous insulin because you don't make any glucose. The liver just pumps out all this extra glucose. And then there are some tissues in the body that do have a requirement for glucose. They can't fatter that particularly certain cells in the brain and the red blood cells. So they need whatever glucose you have to be spared for those, for those cells. Their metabolic health has almost improved if they were overweight or insulin resistant before.

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